Why I can't copy, cut, and paste on Google Docs?
Google requires the Google Docs Offline extension installed to enable copy, cut, and paste. However, Puffin Cloud Isolation does not support the third-party extensions. Instead, please try the keyboard shortcuts below:
Ctrl+C for Copy
Ctrl+V for Cut
Ctrl+V for Paste
⌘+C for Copy
⌘+V for Cut
⌘+V for Paste
To understand more about Puffin Cloud Isolation not supporting the third-party extensions, please refer to this article.